package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Slf4j
@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam param) {
//        1. 动态构建出查询需要的 dsl 语句
        SearchResult result = null;

//        1.准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);

        try {
            //        2.执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
//            3.分析响应数据封装成我们需要的格式
            result = buildSearchResult(response, param);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return result;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {

        SearchResult result = new SearchResult();
//        返回的所有查询到的商品
        SearchHits hits = response.getHits();
        ArrayList<SkuEsModel> esModels = new ArrayList<>();
        if(hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if(!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].toString();
                    skuEsModel.setSkuTitle(string);
                }
                esModels.add(skuEsModel);
            }
        }
        result.setProducts(esModels);

//        当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
//            attrId
            long attrId = bucket.getKeyAsNumber().longValue();
//            attrName
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
//            得到属性所有的值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String attrValue = item.getKeyAsString();
                return attrValue;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);

//        当前所有商品涉及到的所有品牌信息
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
//            brandId
            long brandId = bucket.getKeyAsNumber().longValue();
//            brandName
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

//        当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
//            获得分类Id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
//            获得分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

//        ===========以上从聚合信息中获取===============
//        分页信息-页码
        result.setPageNum(param.getPageNum());

//        分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);

//        分页信息-总页码
        int totalPages = (int)total % EsConstant.PRODUCT_SIZE == 0 ? (int)total / EsConstant.PRODUCT_SIZE : ((int)total / EsConstant.PRODUCT_SIZE + 1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for(int i =1; i <= totalPages; i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        if(param.getAttrs() != null && param.getAttrs().size() > 0){
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>(){});
                    navVo.setNavName(data.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }

//            取消这个面包屑以后，我们要跳转到那个地方，将请求地址的url里面的当前值置空
                String replace = replaceQueryString(param, attr, "attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);

                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }
        //            品牌、分类
        if(param.getBrandId() != null && param.getBrandId().size() > 0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            // 远程查询所有品牌
            R r = productFeignService.brandInfo(param.getBrandId());
            if(r.getCode() == 0){
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = null;
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName() + ";");
                    replace = replaceQueryString(param, brandVo.getBrandId()+"", "brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimal l.com/list.html?" + replace);
            }
            navs.add(navVo);
        }

//        TODO 分类： 不需要导航地址

        return result;
    }

    private static String replaceQueryString(SearchParam param, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode = encode.replace("+", "%20"); // 浏览器对空格的编码和 Java 不一样
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
        String replace = param.get_queryString().replace("&"+key+"=" + encode, "");
        return replace;
    }

    /**
     * 准备检索请求
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
//        模糊匹配， 过滤
//        构建 bool query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
//        must 条件
        if(!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
//      构建 filter 三级分类
        if(param.getCatalog3Id() != null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
//        filter 品牌ID
        if(param.getBrandId() != null && param.getBrandId().size() > 0){
            boolQuery.filter(QueryBuilders.termQuery("brandId", param.getBrandId()));
        }
//        filter 所有指定的属性
        if(param.getAttrs() != null && param.getAttrs().size() > 0){
            for (String attrStr : param.getAttrs()) {
                //            attrs=1_5寸:8寸&attr=2_16G:32G
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
//              attrs=1_5寸:8寸
                String[] s = attrStr.split("_");
                String attrId = s[0]; // 检索的属性ID
                String[] attrValues = s[1].split(":"); // 这个属性检索用的值
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
//                每一个都要生成一个嵌入式的查询 nestedQuery
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
//        filter 是否有库存
        if(param.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }
//        filter 价格区间
        if(!StringUtils.isEmpty(param.getSkuPrice())){
//            1_500 1-500 | _500 <500 | 500_ >500
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if(s.length == 2 && !StringUtils.isEmpty(s[0])){
//                区间
                rangeQuery.gte(s[0]).lte(s[1]);
            }
            if(s.length == 2 && StringUtils.isEmpty(s[0])){
                log.info("小于：{}",s[1]);
                rangeQuery.lte(s[1]);
            }
            if(s.length == 1){
                log.info("大于：{}",s[0]);
                rangeQuery.gte(s[0]);
            }
            boolQuery.filter(rangeQuery);
        }

//        把以前的所有条件都拿来进行封装
        sourceBuilder.query(boolQuery);
//        排序，分页，高亮
//        排序
        if(!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }
//        分页
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_SIZE);
        sourceBuilder.size(EsConstant.PRODUCT_SIZE);
//        高亮
        if(!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

//        聚合分析
//        品牌聚合
        TermsAggregationBuilder brandAgg = AggregationBuilders.terms("brand_agg");
        brandAgg.field("brandId").size(50);
//        品牌聚合的子聚合
        brandAgg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName")).size(1);
        brandAgg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg")).size(1);
        sourceBuilder.aggregation(brandAgg);

        //      分类聚合
        TermsAggregationBuilder catalogAgg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalogAgg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName")).size(1);
        sourceBuilder.aggregation(catalogAgg);

//        属性聚合
        NestedAggregationBuilder attrAgg = AggregationBuilders.nested("attr_agg", "attrs");
//        聚合出当前所有的 attrId
        TermsAggregationBuilder attrIdAgg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
//        聚合分析出当前 attrId 对应的名字
        attrIdAgg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
//        聚合分析出当前 attrId 对应的所有可能的属性值
        attrIdAgg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attrAgg.subAggregation(attrIdAgg);
        sourceBuilder.aggregation(attrAgg);

        String builderString = sourceBuilder.toString();
        log.info("构建的dsl:{}", builderString);
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }
}
